More like 200%-900% on a lot of items. When I was a sales associate at big box retail the big ticket items were sold nearly at cost (~10%). The addons were wher

More like 200%-900% on a lot of items. When I was a sales associate at big box retail the big ticket items were sold nearly at cost (~10%). The addons were where the money was made and fat commissions. If you were selling Playstations the charging stands, USB cables, HDMI cables cost the store a few cents but marked up $10-$50.